Multiple choice

Which of the following symmetries is possessed by roundworms?

  1. Radial

  2. Bilateral

  3. Biradial

  4. Spherical

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Roundworms (Nematoda) exhibit bilateral symmetry, where the body can be divided into two mirror-image halves along a single plane. This is different from radial symmetry (echinoderms, cnidarians) or spherical symmetry (some protozoans). Biradial symmetry is seen in ctenophores.